Malicious PDF — malware analysis report

Static analysis result for SHA-256 fa7bd15a20b10148…

MALICIOUS

PDF

43.1 KB Created: 2020-08-23 04:40:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 9a27c48364eb0c08b7b3870f5c2969e1 SHA-1: 6af7981163b0bd8454edd9c64ac0ebc978994385 SHA-256: fa7bd15a20b10148e7c14e25988d0d7a2e0ff64184c5a0396a8cb91918b6dae3
150 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains a heuristic firing for a malicious redirector link, pointing to 'https://ttraff.cc/pify?keyword=articles+worksheet+for+class+2'. Additionally, it exhibits characteristics of a PDF link farm, embedding numerous external links, one of which is hosted on a suspicious domain. The document body, though heavily obfuscated, contains the same suspicious URL and appears to be a lure related to 'articles worksheet for class 2'. The ML classifier also strongly indicated maliciousness.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 3

  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://ttraff.cc/pify?keyword=articles+worksheet+for+class+2
    • http://tuwobugu.cs.ogdcl-nthp.com/uploads/1/3/1/6/131606066/b728b1eb1687951.pdf
    • https://cdn.shopify.com/s/files/1/0432/6604/8165/files/tata_bluescope_roofing_sheet_weight.pdf
    • https://cdn.shopify.com/s/files/1/0431/0417/4233/files/57988728895.pdf
    • https://cdn.shopify.com/s/files/1/0441/0372/9304/files/lidabefewimasogojevajas.pdf
    • https://cdn.shopify.com/s/files/1/0440/5588/8022/files/frases_avanzadas_en_ingles.pdf
    • https://cdn.shopify.com/s/files/1/0430/9535/9641/files/nijazubotewojikezulot.pdf
    • https://cdn.shopify.com/s/files/1/0438/5737/9488/files/37634446278.pdf
    • https://cdn.shopify.com/s/files/1/0433/0881/0398/files/wepomufaguxedizebaw.pdf
    • https://cdn.shopify.com/s/files/1/0434/6917/6992/files/punctuation_marks_chart.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00006af1.bin
a2f12c6e360cff58bd71237fa3eef39883f2cb9b9f9feb7793957e26ed1d54e4		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6AF1 5248 bytes
font_01_sfnt_off00007cce.bin
9107199c120f3c2dfb77b30c3584fe0768221914a1a78788b83a5e8e375003ac		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7CCE 10248 bytes

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